Based on the lunar calendar, Ramadan is the ninth month in the Islamic calendar and consists of 29 or 30 days depending on the sighting of the moon.

Eid-ul-Fitr, one of two celebratory holidays in Islam, will likely take place on Sunday.

The celebration begins with prayer. It continues with celebratory meals and gatherings with friends and family.

Thousands of local Muslims are expected to participate in services at area mosques.

The Islamic Society of Baltimore said it will tentatively hold prayer and a sermon in congregation on Sunday. After the moon is sighted, an announcement about Eid and prayer timings will be online Friday night at www.isb.org.